Improvement in grinding-mills



'UNITED STATES PATENT OFFICE.

JoHN c. EAKER, oE PHILADELPHIA, PENNSYLVANIA, AssIcNoR To THE ENTERPRIsE MANUFACTURING COMPANY, oE sAME PLACE.

lMPRovEMENT IN GRINDlNG-MILLS.

Specification forming part of Letters Patent No. 143,867, dated October 21, 1873 application led Jny 5, 1873.

. grinding-mill within the casing, and to enable the same to be readily removed when necessary; and, second, to prevent waste of the material to be ground in its passage from the hopper to the space between the burrs.

I attain the first of these objects by simply' confining the burr F and shell G and mill-spin dle D (see perspective view, Figure l) between the upper and lower hinged sections of the casing, (shown in the plan view Fig. 2, and vertical Section, Eig. 3,) the Shen having lugs upon its periphery adapted to corresponding recesses and slotted lugs in the two sections of ,thefcasing, between which it is thus rigidly "secured and the second object is attained by lthe combination, with an opening, c, in the.

fixedl shell, of a partition or chute, w, cast within the upper section ot' 'the casing, by which communication is established between the hopper and interior of said shell.

The outer casing of the mill consists of two v semicireular parts, A and B, which meet at the horizontal line w :c drawn through the center of the mill-spindle D, on which line also is the center-pin of the hinge a, connecting together the two halves of the casing, the latter being further secured at a point opposite the hinge by a bolt, b, connected to lugsd on the lower portion B of the casing, and having a thumb-nut bearing on a slotted lug on the upper portion A of thecasing, so 'that the latter, after loosening the nut and depressing the bolt, can be turned outward and downward, thereby exposing the interior works of the Inill, and permitting their removal from the Casin g. (See sectional elevation, Fig. 3.) The hopper c is secured to the upper half A of the casing at m, and the lower portion of thelatter is at tached, at y, to the base f, which contains the drawer for receiving the ground material. The mill-spindle D has its bearings partly in the upper and partly in the lower portion of the casin g, and is furnished at one end with a suitable handle, the other end bearing against a1 washer, h, acted on by a screw, e', which passes the spindle is adjusted for coarse or ine grinding, it cannot turn with the spindle.-

The coii'ee or other material is ground by causing it to pass from the hopper between a rotating burr, F, keyed to the spindle, and a iixed shell, G, through which the spindle passes,

but which is rigidly confined between the two halves of the casing in the manner which I will now proceed to describe.

The hollow conical portion 7c of the shell Gr has a disk-like flange, 7s', on the edges of which are six lugs, p p, q qv, and r 1, the two latter of which, when the spindle and its burrs are placed in position upon the lower section of the casing, enter recesses s s formed for their reception in the latter, the exact position of the shell being thus determined before the upper section of the casing is closed upon the same. In thus adapting the lugs 1" of the shell to the recesses s its lugs q q are also fitted to slotted lugs t t formed in the lower half of the casing; and similar slotted lugs u u on the upper half of the" casing adapt themselves to the lugs p p of the shell when the said upper half is closed upon the lower, as shown in Fig. 3, thus rigidly confining the shell G, and enabling the burr F secured to the spindle to be adjusted from and toward the same for coarse and fine grinding, while by simply separating the two halves of the casing-both burr and shell-the spindle can be lifted out oi' the mill, and ready access thus obtained to all parts of the latter for purposes of cleansing or repairs. Au opening, c, is formed in the upper portion"of the iixed shell G, and a partition or chute, w, cast'witln'n the upper haliI of the easing, ts snugly over this opening when the mill is closed, and forms a communication between the same and the hopper e, and thus directs the whole of the material to be ground into the space between the burr and portion A of the casing, and forming, with thcshell. said ilange, a chute, as set forth.

I claim as my invention- In testimony whereof I have signed my 1. The combination, substantially as dename to this specication in the presence of scribed, of the fixed shell G and its lugs with two snbscribing'witnesses.

the slotted lugs and recesses in the upper and JOHN G. BAKER. lower halves of the casing, between which the said shell is retained, as set forth. Titnessesz 2. The combination of the ange 7a' of the THOMAS MCILVAIN, shell with the partition w, cast in the upper HARRY SMITH. 

